Warrants have been issued for Carlos Rivera-Diaz, 26, and Angel Luis Arroyo, 24, both of Philadelphia.

The Lancaster County District Attorney’s Office says the men were in a Honda Civic that was pulled over on the 400 block of Dauphin Street in Lancaster on April 19. Later, police obtained a search warrant and went through the car, where they found hidden compartments containing 4,000 bags of heroin, according to the DA’s office. The drugs are estimated to be worth about $40,000.

Investigators think Rivera-Diaz and Arroyo were taking the drugs into Lancaster to be sold. Both men are considered to be fugitives.

Officials said because the drugs were so well hidden, they had to let the men go. It took time to obtain the search warrant. While they were waiting, they could not detain the men.